Guide ring for sprinkler heads and method of manufacturing the same

Abstract

To provide a guide ring for sprinkler heads capable of making a guide piece part longer when manufacturing the guide ring from a flat plate by punching or cutting, and a method of manufacturing the same.SOLUTION: A method of manufacturing a guide ring 1 for sprinkler heads includes: a first step of remaining a plurality of pre-raising guide piece parts 7 extending from a portion, which becomes a ring part 3, in a central direction and the ring part 3 and removing portions other than these from a metal flat plate by punching or cutting; and a second step of folding and raising the pre-raising guide piece parts 7 and making them into guide piece parts 5. The plurality of pre-raising guide piece parts 7 are formed in a shape in which a tip end portion 9 is deviated in the same direction from a center in a width direction. Thus, in relative to a case where the tip end portion 9 is located in the center in the width direction, a distance from a base portion to the tip end portion 9 can be made longer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a guide ring for a sprinkler head that guides a deflector so that it descends to a predetermined position when the sprinkler head is activated, and to a method for manufacturing the same. [Background technology]

[0002] The sprinkler head is provided with a guide ring for the sprinkler head (hereinafter simply referred to as a "guide ring") that guides the deflector so that it descends to a predetermined position when activated (see, for example, paragraph

[0029] of Patent Document 1).

[0003] An example of the guide ring 21 and its manufacturing method will be described with reference to Fig. 5. As shown in Fig. 5(b), the guide ring 21 has a ring portion 23 and a plurality of guide piece portions 25 rising from the ring portion 23, and the ring portion 23 is provided with an insertion hole 27 into which a guide rod 45 is inserted. The guide ring 21 guides the guide rod 45 through the insertion hole 27 so that the guide ring 21 descends to a predetermined position when the sprinkler head is activated, and the deflector 43 also descends to a predetermined position.

[0004] The manufacturing procedure for the guide ring 21 will be described below. First, a circular metal plate is punched or cut away to remove all parts except the ring portion 23 and the three front-standing guide pieces 29 extending from the portion that will become the ring portion 23 toward the center. This state is shown in Figure 5(a).

[0005] Next, the pre-standing guide piece 29 is bent at its base and made to stand up to form the guide piece 25. This state is shown in Fig. 5(b), and the length (height) of the guide piece 25 is 5 mm.

[0006] FIG. 6 shows a state in which the guide ring 21 shown in FIG. 5(b) is attached to a sprinkler head 31. In Figure 6, 33 is the head body having the water discharge barrel 35, 39 is a frame provided on the head body 33 and having a locking claw 37 at its lower end, and 41 is the water spray part, which is composed of a deflector 43, a guide rod 45, a guide ring 21, and a valve body 47. Further, 49 is a thermal decomposition unit, which is composed of a thermal sensor 51, a ball holding mechanism 53, a set screw 55, etc. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-144153 Summary of the Invention [Problem to be solved by the invention]

[0008] The outer diameter of the guide ring 21 is determined by the size of the sprinkler head 31. To process the guide ring 21 by punching or cutting as shown in FIG. 5(a), a predetermined gap (cutout width) is required between the tips of adjacent front-standing guide pieces 29. This gap is shown as 3.4 mm in Figure 5(a). As described above, the outer diameter of the metal plate is fixed, and a certain clearance width is required, so there is a limit to the length of the pre-standing guide piece 29, and as a result, there is also a limit to the length (height) of the guide piece 25. In this example, the length of the guide piece 25 is 5 mm, which is the guide stroke (denoted as guide ST).

[0009] That is, when the guide ring 21 is manufactured by punching or cutting out a circular metal plate, there is a problem in that the length of the guide piece portion 25 cannot be increased. The problem that occurs when the length of the guide piece portion 25 is short will be explained with reference to FIG. 7, which is an explanatory diagram of the operation of the sprinkler head 31 of FIG. In addition, the thermal decomposition unit 49 is not shown in FIG.

[0010] From the state before operation shown in Figure 7(a), the guide piece portion 25 is guided by the water discharge barrel 35 while the water spray portion 41 drops 4.6 mm, and Figure 7(b) shows the state just before the upper end of the guide piece portion 25 separates from the lower end of the water discharge barrel 35. Thereafter, when the upper end of guide piece portion 25 moves away from the lower end of water discharge cylinder 35, there is nothing to guide the entire unit straight, and in some cases water discharge portion 41 may tilt.

[0011] As shown in Figure 7(c), when spray unit 41 is tilted by 11.1 degrees, the right side of ring unit 23 of guide ring 21 in the figure abuts against locking claw 37 before the left side, and deflector 43 separates from guide ring 21 and moves diagonally downward, guided by guide rod 45. When deflector 43 moves downward in this tilted state, as shown in Figure 7(d), the left end of deflector 43 in the figure abuts against locking claw 37 of frame 39, preventing deflector 43 from falling any further. In this state, the sprinkler head cannot spray water as specified.

[0012] The state shown in FIG. 7(d) occurs because the guide piece 25 comes off the water discharge cylinder 35 prematurely and is not guided vertically downward sufficiently. To prevent this, the guide piece 25 may be made longer. On the other hand, as explained in FIG. 5(a), when the guide ring 21 is manufactured by punching or cutting out a circular metal plate, there is a limit to how long the guide piece portion 25 can be made by the conventional method.

[0013] The present invention has been made to solve such problems, and aims to provide a guide ring for a sprinkler head and a method for manufacturing the same that can lengthen the guide piece portion when the guide ring is manufactured by punching or cutting out from a flat metal plate. [Means for solving the problem]

[0014] (1) The present invention relates to a method for manufacturing a guide ring for a sprinkler head, which is provided on a sprinkler head and has a heat-sensitive decomposition portion supporting a valve body, and when the heat-sensitive decomposition portion decomposes, the valve body opens and a deflector descends, the guide ring having a ring portion and a plurality of guide pieces rising from the ring portion and guiding the deflector to descend to a predetermined position, a first step of punching or cutting out portions of the metal flat plate, leaving only a plurality of pre-standing guide pieces extending from the portion that will become the ring portion toward the center and the ring portion; a second step of bending the front-standing guide piece portion at the base portion to make it stand up as the guide piece portion, A method for manufacturing a guide ring for a sprinkler head, characterized in that the tips of the multiple upright front guide pieces are shaped so that they are shifted in the same direction from the center in the width direction, thereby making it possible to make the distance from the base to the tip longer than when the tip is at the center in the width direction.

[0015] (2) A guide ring for a sprinkler head according to the present invention is manufactured by the manufacturing method described in (1) above.

[0016] (3) A guide ring for a sprinkler head according to the present invention has a heat-sensitive decomposition portion that supports a valve body, and is provided on a sprinkler head in which the valve body opens when the heat-sensitive decomposition portion decomposes, causing a deflector to descend, and guides the deflector to descend to a predetermined position. The device has a ring portion and a plurality of guide pieces rising from the ring portion, The guide pieces are characterized in that their tip ends are displaced in the same direction from the widthwise center.

[0017] (4) In addition, in the above (3), each guide piece has an inclined side portion that is inclined from one side in the width direction to the tip on the other side. [Effects of the Invention]

[0018] In the method for manufacturing a guide ring for a sprinkler head according to the present invention, the tips of the plurality of front-standing guide pieces are offset in the same direction from the center of the width of the guide piece, which allows the distance from the base to the tip to be longer than when the tips are at the center of the width. This lengthens the guide piece and the guide stroke, making it possible to lower the sprinkler head to a predetermined position. [Brief explanation of the drawings]

[0019] [Figure 1] 5A to 5C are explanatory diagrams of a method for manufacturing a guide ring for a sprinkler head according to an embodiment. [Figure 2] 4A and 4B are explanatory diagrams of the shape of a guide ring for a sprinkler head according to an embodiment. [Figure 3] 1 is an explanatory diagram of a state in which a guide ring for a sprinkler head according to an embodiment is installed on a sprinkler head. [Figure 4] 1 is an explanatory diagram of an operating state of a sprinkler head equipped with a guide ring for a sprinkler head according to an embodiment. [Figure 5] 10A and 10B are explanatory diagrams of a conventional method for manufacturing a sprinkler guide ring. [Figure 6] FIG. 10 is an explanatory diagram of a conventional sprinkler head guide ring installed on a sprinkler head. [Figure 7] 10 is an explanatory diagram of the operating state of a sprinkler head equipped with a conventional sprinkler head guide ring. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] The guide ring 1 for a sprinkler head in this embodiment (hereinafter simply referred to as the "guide ring") has a heat-sensitive decomposition portion 49 that supports a valve body 47, as explained in the background art, and is installed on a sprinkler head in which, when the heat-sensitive decomposition portion 49 decomposes, the valve body 47 opens and the deflector 43 descends (see Figure 3). The guide ring 1 has a ring portion 3 and a plurality of guide pieces 5 rising from the ring portion 3, and guides the deflector 43 so that it descends to a predetermined position when the sprinkler head is activated.

[0021] The manufacturing method of the guide ring 1 includes a first step of punching or cutting out the entire surface of a circular metal plate, leaving only the three pre-standing guide pieces 7 extending from the portion that will become the ring portion 3 toward the center and the ring portion 3 (see Figure 1(a)), and a second step of bending the pre-standing guide pieces 7 at their bases to make them stand up and form the guide piece portions 5 (see Figure 1(b)).

[0022] The three front standing guide pieces 7 have tip ends 9 that are offset in the same direction from the center in the width direction. That is, as shown in FIG. 3(a), the front end 9 of the front standing guide piece 7 is offset from the center line 11 in the clockwise direction in the drawing.

[0023] The shape of the front guide piece 7 will be described in detail with reference to the partially enlarged view of Figure 1(a). The front guide piece 7 has a uniform width portion 13 that extends from the base toward the center of the metal plate, and a reduced width portion 15 that is continuous with the uniform width portion 13 and gradually reduces in width toward the center. One side 17 of the reduced width portion 15 (the side 17 on the left side as you face the center) extends straight from the uniform width portion 13 toward the tip 9, and the other side is an inclined side 19 that inclines from the uniform width portion 13 toward the tip of the one side 17.

[0024] Due to the above-described shape, the tip end 9 of each front standing guide piece 7 is disposed so as to face the inclined side 19 of the adjacent front standing guide piece 7 . Therefore, the length from the base to the tip can be made longer than when the pre-standing guide piece 7 extends straight from the base to the tip with the same width, or when the tip 9 does not deviate from the center line 11 even if the width narrows toward the tip, and it is possible to provide a specified gap (gap width) between adjacent pieces. In the example shown in FIG. 1(a), the clearance width is set to 1.04 mm.

[0025] When the pre-standing guide piece portion 7 is bent at the base and made to stand up as the guide piece portion 5 (see Figure 1 (b)), an opening 20 is formed inside the ring portion 3, into which the water discharge barrel 35 is inserted. Three guide pieces 5 are formed around the opening 20, and the inclined edges 19 of the narrowed portions 15 of each guide piece 5 are all inclined in the same direction (diagonally upward to the right when the guide piece 5 is viewed from the front). As shown in FIG. 2, the guide piece 5 has a height of 7 mm, which is 2 mm higher than the 5 mm of the conventional example shown in FIG. 5(b).

[0026] Fig. 3 shows the guide ring 1 attached to the sprinkler head 31. In Fig. 3, the same parts as those in Fig. 6 are denoted by the same reference numerals.

[0027] The operation of the sprinkler head 31 equipped with the guide ring 1 of this embodiment will be described with reference to FIG. From the state before operation shown in Figure 4(a), the guide piece portion 5 is guided by the water discharge barrel 35 and the water spray portion 41 descends by 6.6 mm, and Figure 4(b) shows the state just before the upper end of the guide piece portion 5 separates from the lower end of the water discharge barrel 35. Thereafter, when the upper end of the guide piece portion 5 moves away from the lower end of the water discharge cylinder 35, there is nothing to guide the entire unit straight, and in some cases the water discharge portion 41 may tilt.

[0028] In this case, as shown in Figure 4(c), when the sprinkler section 41 is tilted by 5.4°, the right side of the ring section 3 of the guide ring 1 in the figure abuts against the locking claw 37 before the left side, causing the deflector 43 to move away from the guide ring 21 and, guided by the guide rod 45, move diagonally downward. At this time, unlike the conventional example, the inclination of deflector 43 is small, so as shown in Figure 4(d), deflector 43 descends to the specified position without coming into contact with locking claw 37 of frame 39. In Figure 4(d), it is inclined at 5.4°, but because deflector 43 is exposed from frame 39, the left side of ring portion 3 in the figure also comes into contact with locking claw 37, deflector 43 becomes horizontal, and water can be sprayed as specified.

[0029] As described above, according to the manufacturing method of this embodiment, when a guide ring is manufactured by punching or cutting out a metal plate having a specified outer diameter, it is possible to manufacture the guide ring with a longer guide piece portion 5. This increases the guide stroke, making it possible to lower the sprinkler head to a predetermined position.

[0030] Conversely, if the guide ring 1 has a shape in which the tip 9 of the guide piece portion 5 is shifted in the same direction from the center in the width direction, the length of the pre-standing guide piece portion 7 can be increased and manufactured by punching or cutting out from a metal plate having a specified outer diameter.

[0031] In the above description, an example in which there are three guide pieces is given, but the number of guide pieces is not limited to this, and may be two, or four or more. [Explanation of symbols]

[0032] 1. Guide ring for sprinkler head (embodiment) 3 Ring part (embodiment) 5 Guide piece (embodiment) 7 Front guide piece (embodiment) 9 Tip 11 Center line 13 Same width part 15 Reduced width section 17 Sides 19 Inclined Edge 20 Opening 21 Guide ring (conventional example) 23 Ring section (conventional example) 25 Guide piece (conventional example) 27 Insertion hole 29 Front guide piece (conventional example) 31 Sprinkler Head 33 Head body 35 Water cannon 37 Locking claw 39 frames 41 Sprinkler section 43 Deflector 45 guide rod 47 Valve body 49 Thermal decomposition unit 51 Thermal sensor 53 Ball retention mechanism 55 Set screw

Claims

1. A method for manufacturing a guide ring for a sprinkler head, which is provided on a sprinkler head and has a heat-sensitive decomposition part supporting a valve body, and when the heat-sensitive decomposition part decomposes, the valve body opens and a deflector descends, the guide ring has a ring part and a plurality of guide pieces rising from the ring part, and guides the deflector to descend to a predetermined position, a first step of punching or cutting out portions of the metal plate, leaving only a plurality of front-standing guide pieces extending from a portion that will become the ring portion toward the center and the ring portion; a second step of bending the front-standing guide piece portion at the base portion to make it stand up as the guide piece portion, A method for manufacturing a guide ring for a sprinkler head, characterized in that the tips of the multiple upright front guide pieces are shaped so that they are shifted in the same direction from the center in the width direction, thereby making it possible to make the distance from the base to the tip longer than when the tip is at the center in the width direction.

2. A guide ring for a sprinkler head, manufactured by the manufacturing method according to claim 1.

3. A guide ring for a sprinkler head is provided on a sprinkler head having a heat-sensitive decomposition portion supporting a valve body, the valve body being opened when the heat-sensitive decomposition portion decomposes, causing a deflector to descend, the guide ring guiding the deflector to descend to a predetermined position, The device has a ring portion and a plurality of guide pieces rising from the ring portion, A guide ring for a sprinkler head, wherein the guide pieces have tips that are offset in the same direction from the widthwise center.

4. 4. The guide ring for a sprinkler head according to claim 3, wherein each guide piece has an inclined side portion inclined from one side to the other side in the width direction.

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